五上数学小数简便运算八大经典题型

五上数学小数简便运算八大经典题型用简便方法计算。8.9×10.1=8.9×(10+0.1)=8.9×10+8.9×0.1=89+0.89=89.891.25×19×0.8=1.25×0.8×19=1×19=1979-3.6-16.4=79-(3.6+16.4)=79-20=591.25×48.6×0.8=1.25×0.8×48.6=1×48.6=48.610.1×46=10×46+0.1×46=460+4.6=464.64.8×12.5=(4+0.8)×12.5=4×12.5+0.8×12.5=50+10=6013.4+5.62+17.6+4.38=(13.4+17.6)+(5.62+4.38)=31+10=418.16-5.49-0.51=8.16-(5.49+0.51)=8.16-6=2.166.73×4.8+5.2×6.73=6.73×(4.8+5.2)=6.73×10=67.30.345×4×0.25=0.345×(4×0.25)=0.345×1=0.345用简便方法计算。416×67-416+34×416=416×(67-1+34)=416×(66+34)=416×100=416004.27×101-4.27=4.27×(101-1)=4.27×100=42761-3.3-7.7=61-(3.3+7.7)=61-11=507.75÷(7.75÷0.25)=7.75÷7.75×0.25=1×0.25=0.2515÷(0.15×0.4)=15÷0.15÷0.4=100÷0.4=25040.4×2.5=(40+0.4)×2.5=40×2.5+0.4×2.5=100+1=10168.9÷0.5÷0.2=68.9÷(0.5×0.2)=68.9÷0.1=6890.25×1.25×3.2=0.25×3.2×1.25=0.8×1.25=132.8×0.46+6.72×4.6=4.6×(3.28+6.72)=4.6×10=464.8+(7.25-2.05)×2.5=4.8+5.2×2.5=4.8+13=17用简便方法计算。42÷0.25÷4=42÷(0.25×4)=42÷1=4216.26-(3.58+6.26)=16.26-6.26-3.58=10-3.58=6.421.9+0.56+8.1+0.44=(1.9+8.1)+(0.56+0.44)=10+1=110.57×101-0.57=0.57×(101-1)=0.57×100=570.76÷0.25÷4=0.76÷(0.25×4)=0.76÷1=0.7618.5÷4÷0.25=18.5÷(4×0.25)=18.5÷1=18.578.4×101-78.4=78.4×(101-1)=78.4×100=784016.4×3.5+65×1.64=16.4×(3.5+6.5)=16.4×10=1643.14×32-3.14×22=3.14×(32-22)=3.14×10=31.44.6+1.28+5.4+0.72=(4.6+5.4)+(1.28+0.72)=10+2=12用简便方法计算。0.25×32×12.5=0.25×4×(8×12.5)=1×100=10045.2×99+45.2=45.2×(99+1)=45.2×100=45200.85×99=0.85×100-0.85×1=85-0.85=84.156.4×3.7+6.4×6.3=6.4×(3.7+6.3)=6.4×10=642.78×1.25×8=2.78×(1.25×8)=2.78×10=27.86.28+13.75+3.72=(6.28+3.72)+13.75=10+13.75=23.753.9+0.56+6.1+0.44=(3.9+6.1)+(0.56+0.44)=10+1=116.23×1.02-6.23×0.02=6.23×(1.02-0.02)=6.23×1=6.2315.36÷0.25÷4=15.36÷(0.25×4)=15.36÷1=15.365.8×4.5+4.2×4.5=(5.8+4.2)×4.5=10×4.5=45用简便方法计算。15.67-(5.67+3.2)=15.67-5.67-3.2=10-3.2=6.81.7×101-1.7=1.7×(101-1)=1.7×100=17012.5×88=12.5×8×11=100×11=110012.4+5.62+17.6+4.38=(12.4+17.6)+(5.62+4.38)=30+10=40(0.4+4)×2.5=0.4×2.5+4×2.5=1+10=1189.2-(9.2-8.65)=89.2-9.2+8.65=80+8.65=88.658×1.03×0.125=8×0.125×1.03=1×1.03=1.035.6×99+5.6=5.6×