Question

31.2×3.6+16×1又四分之一加43.7×6.4的简便运算方法？

Answer 1

31.2×3.6+16×1又4分之1+43.7×6.4
=31.2×3.6+16×1.25+(31.2+12.5)×6.4
=31.2×3.6+16×1.25+31.2×6.4+12.5×6.4
=（31.2×3.6+31.2×6.4）+（16×1.25+12.5×6.4）
=31.2×（3.6+6.4）+（16×1.25+1.25×64）
=31.2×10+（16+64）×1.25
=312+80×1.25
=312+100
=412

Answer 2

你好，等式31.2*3.6+16*（1+1/4）+43.7*6.4=31.2*3.6+16*1+16*1/4+43.7*6.4=31.2*3.6+16+4+43.7*6.4=31.2*4*0.9+20+43.7*6.4=124.8+*0.9+20+43.7*6.4=124.8-12.48+20+43.7*6.4=412

Answer 3

1又四分之一等于5/4
原式=31.2×3.6+16×5/4+43.7×6.4
=31.2×3.6+4×5+43.7×6.4
=31.2×9×4+4×5+43.7×4×4×4
=4×（31.2×9+5+43.7×4×4）
=4×（280.8+5+174.8×4）
=4×（285.8+699.2）
=4×985
=3940