脱式计算(能简算的要简算).1.8×5.46+1.8×4.544×0.8×12.5×2.59.07-22.78÷3.4.
(1)1.8×5.46+1.8×4.54
=1.8×(5.46+4.54)
=1.8×10
=18;
(2)4×0.8×12.5×2.5
=4×2.5×0.8×12.5
=(4×2.5)×(0.8×12.5)
=10×10
=100;
(3)9.07-22.78÷3.4
=9.07-6.7
=2.37.
=1.8×(5.46+4.54)
=1.8×10
=18;
(2)4×0.8×12.5×2.5
=4×2.5×0.8×12.5
=(4×2.5)×(0.8×12.5)
=10×10
=100;
(3)9.07-22.78÷3.4
=9.07-6.7
=2.37.
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